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The product of matrices A=[[cos^2theta,s...

The product of matrices `A=[[cos^2theta,sinthetacostheta],[sinthetacostheta,sin^2theta]]` and `B=[[cos^2phi,sinphicosphi],[sinphicosphi,sin^2phi]]` is a null matrix if `theta-phi=` (A) `2npi,n in Z` (B) `(npi)/2, n in Z` (C) `(2n+1)pi/2, n in Z` (D) `npi, n in Z`

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